Want to eat less meat but keep slipping back?

11 November 2026

What behaviour science says about changing habits

By the ACTAsia Compassionate Choices Network team · Updated 9 November 2026. ACTAsia’s Compassionate Choices Network designs its Plant Forward campaign around behaviour science. Registered charity, England and Wales, no. 1127625.

Lasting change to eating habits comes in stages, not overnight. Behaviour science describes five: not yet thinking about it, thinking about it, preparing, acting and keeping it going. New habits take a median of 66 days to become automatic, and missing one day does not undo progress. Small, specific swaps with support from family and friends work best.

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Why willpower alone rarely works

Most of what we eat is not decided in the moment. It is habit: the same breakfast, the same lunch order, the dishes our families have always cooked. Habits are triggered by cues, such as a time of day, a place or the people we are with, so they run without much thought. That is why good intentions fade so quickly when the cues stay the same.

Food is also social. In many cultures, and especially across Asia, meals are shared with family, friends and colleagues, so what one person eats is shaped by everyone around the table. Changing a habit that others share takes more than personal resolve. It takes a plan, time and, ideally, company.

What are the five stages of change?

One of the most widely used models in health psychology, the Transtheoretical Model developed by James Prochaska and Carlo DiClemente, describes change as a journey through stages rather than a single decision. Knowing which stage you are in helps you choose the right next step.

How long does it take to form a habit?

Longer than the internet says, but probably less time than you fear. In a well-known study at University College London, Phillippa Lally and colleagues asked 96 volunteers to repeat a new daily behaviour and tracked how automatic it felt. The median time to reach automaticity was 66 days, and eating habits took about 65 days. The range was wide, from 18 to 254 days, depending on the person and the behaviour.

Two findings from that study are worth remembering. First, missing a single day did not materially affect the habit forming. Second, the popular idea that habits take 21 days does not come from habit research at all: it traces back to a 1960 self-help book by a plastic surgeon about how long patients took to adjust to a new appearance.

How can I eat less meat without feeling deprived?

Start with one meal a day. Swap a single meal for a plant-based one, then build from there.
Attach it to a cue, such as “plant-based lunch on workdays”, so it becomes automatic.
Make it easy: keep tinned beans, lentils, tofu and frozen vegetables in the house.
Cook dishes you already love, made with plants, rather than unfamiliar food.
Focus on adding good things to your plate, not only taking things away.
Invite someone to join you, whether a partner, a friend or a colleague.
Track your swaps for a few weeks. Seeing progress keeps you going.

Why changing habits together works better

People are strongly influenced by what others around them do. When friends, family or colleagues are trying the same change, it feels normal rather than odd, and setbacks are easier to recover from. Research on social norms consistently finds that people are more likely to adopt a behaviour when they see others around them doing it.

This is the thinking behind ACTAsia’s Plant Forward campaign. Run each year by ACTAsia’s Compassionate Choices Network (link: https://www.actasia.org/our-work/ccn-member-bios/) of member organisations across Asia, it is designed around the stages of change: awareness content first, then challenges such as a 10-day meal swap, plant-based bingo and recipe competitions, with participants encouraged to invite family and friends. In many Asian contexts, where food choices are shaped by family and social norms, a shared, community-based approach makes change more acceptable and more likely to last.

What should I do if I slip back into old habits?

Relapse is a normal part of change, not a sign of failure. The stages-of-change model expects people to move back and forth before a new habit settles, and the UCL study found a single missed day made no real difference. Notice what triggered the slip, adjust the plan, and pick up again at the next meal. Progress over months matters far more than a perfect week.

What changing habits together can achieve

When habit change is supported at scale, the numbers add up. ACTAsia’s Plant Forward campaign in China grew from four partner organisations in 2022 to 91 by 2025, and 78% of participants pledged to eat more plant-based food, according to the CCN and Plant Forward Impact Report 2021 to 2025 (link: https://www.actasia.org/wp-content/uploads/2025/10/ACTAsia-CCN-PF-FINAL-Standard.pdf). In 2025, nine network members in seven Asian countries ran 44 events, and the campaign reached students at 46 universities, as reported in ACTAsia’s 2025 Annual Review (link: https://www.actasia.org/news/what-we-achieved-together-actasia-in-2025/).

ACTAsia’s view. Nobody changes how they eat because they were lectured. People change when the new way feels easy, tasty and shared with the people they love. That is why ACTAsia builds its plant-based work around family, community and familiar food, and why it measures success in habits that last, not just pledges made.

Where ACTAsia comes in

ACTAsia is an Asian-founded and Asian-led charity, registered in England and Wales (no. 1127625), that has taught compassion as a skill for twenty years. Through the Compassionate Choices Network and Plant Forward, it helps people across Asia, home to nearly five billion people, make lasting changes that are good for animals, health and the planet. ACTAsia’s analysis finds a pound goes around three times as far in Asia as in the West (Grant C., 2024)

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Frequently asked questions

How do I change my eating habits for good?

Start small and specific: swap one meal a day, link it to a regular cue, keep easy ingredients at home, and involve family or friends. Expect it to take weeks, not days. Behaviour science shows that lasting change happens in stages, and slips along the way are normal.

What are the five stages of change?

The Transtheoretical Model describes five stages: precontemplation (not yet thinking about change), contemplation (weighing it up), preparation (getting ready), action (making the change) and maintenance (keeping it going). People often move back and forth before a new habit settles.

How long does it take to form a habit?

In a University College London study by Phillippa Lally and colleagues, new daily behaviours took a median of 66 days to become automatic, with eating habits around 65 days. Times ranged from 18 to 254 days, so it varies a lot between people and habits.

Is it true it takes 21 days to form a habit?

No. The 21-day idea comes from a 1960 self-help book by a plastic surgeon describing how long patients took to adjust to a changed appearance, not from habit research. Real-world research found a median of 66 days, with a wide range either side.

How can I eat less meat without feeling deprived?

Focus on adding rather than removing: cook dishes you already love with beans, lentils or tofu, start with one plant-based meal a day, and keep easy ingredients on hand. Doing it with someone else and tracking your swaps both make it easier to keep going.

What if I slip back into old habits?

Slipping back is a normal part of change. Research found that missing a single day did not materially affect habit formation. Notice what triggered the slip, adjust your plan, and start again at the next meal rather than giving up.

How does ACTAsia’s Plant Forward campaign help people change their diets?

Plant Forward, run by ACTAsia’s Compassionate Choices Network across Asia, is built around the stages of change. It combines awareness content with challenges such as a 10-day meal swap and community events. In China, 78% of participants pledged to eat more plant-based food.

Small changes. Big difference. Education is urgent. Behaviour is learnt. And anything learnt can be learnt differently. Support plant-based education in Asia.

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